ITunes Studdering Play Back

Hi guys,
I enerverated. I uninstalled and reinstalled iTunes. Download the latest version - no effect. Since one day the play back is studdering... I use a professional sound card called RME'S Fireface 800.
Any ideas?
Regards
mic'man

Hi Dawo,
imagine I justed played the songs I bought at the iTunes store. It's studdering no matter if I play the songs which I bought nor the songs I want to check before I buy them...
Some month ago I've not had those problems... could it have to do whith Apple Quicktime Pro?
As far as I remember, before I bought the Pro version of Quicktime iTunes played well. Is that possible?

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